code: def getArguments(parser):
      "Provides additional validation of the arguments collected by argparse."
      args = parser.parse_args()
      if args.width <= 0:
          raise argparse.ArgumentError(
              args.width, "The contour width must be a positive number."
          )
      return args
  
file_path: medpy/bin/medpy_extract_contour.py
imports: import argparse
  import logging
  import math
  import numpy
  from scipy.ndimage import binary_erosion, binary_dilation, generate_binary_structure
  from medpy.core import Logger
  from medpy.io import load, save
label_desc: Use image node_id 2 for calling a global function with example usage: getArguments(parser) and returns: args